1: Operating Current : 9-15MA. 2: "open" "close" "Momentary" "Self-locking" "Interlock" "Delay" 6 Commands. 3: Two instruction-control mode : AT and MODBUS . 4: Under the AT ,the maximum delay is 9999 seconds, Under the MODBUS ,the maximum delay is 255 seconds 5. AT commands can be made serial HyperTerminal (serial assistant) Enter;MODBUS commands can be made serial HyperTerminal (serial assistant) OR ''Modbus Poll'' Enter; 6. Under the MODBUS mode, it can support up to 247 devices in parallel. 7. With RS485 and RS232 (TTL) dual bus interface. 8. Output control pins 8, 5V TTL level, low level (default) / high level output. 9. Application: Automated industry PLC; Relay Module; Smart Home; Home Automation; Identification system; Motor FW & ; CCTV Camera PTZ Control; Security system; LED dot matrix screen; RS485 remote control; Operating Voltage : DC 6-24V(12V24V Version). Colour:green Material:PCB board+plastic+metal Size:45 x 30 x 15mm Package Contents: 1 * RS485 Module Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.